若ab-ab2=-2,求8ab-4a2b2-8ab2+2ab-2ab2+4a2b2的值

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若ab-ab2=-2,求8ab-4a2b2-8ab2+2ab-2ab2+4a2b2的值

若ab-ab2=-2,求8ab-4a2b2-8ab2+2ab-2ab2+4a2b2的值
若ab-ab2=-2,求8ab-4a2b2-8ab2+2ab-2ab2+4a2b2的值

若ab-ab2=-2,求8ab-4a2b2-8ab2+2ab-2ab2+4a2b2的值
8ab-4a²b²-8ab²+2ab-2ab²+4a²b²
=10ab-10ab²
=10(ab-ab²)
=10*(-2)=-20

答:
ab-ab^2=-2
8ab-4a2b2-8ab2+2ab-2ab2+4a2b2
=(8ab-8ab^2)+(-4a^2b^2+4a^2b^2)+(2ab-2ab^2)
=8(ab-ab^2)+0+2(ab-2ab^2)
=10(ab-ab^2)
=10*(-2)
=-20